The topic of this paper is police affairs and police powers. In the first part of the paper, I dealt with the history of policing from the 13th century to more recent times, the organization of the police as the first organized armed formation at the beginning of the Homeland War. The next chapter is on the organization of the police in the Republic of Croatia through all hierarchical levels. Furthermore, we come to the important part that I have processed through two parts, the first lists the police work and the principles of performance, and the second the division of police powers.This thesis consists of five chapters which describe in detail the police, which is a necessary segment of the state by which the state ensures the preservation of public order and peace, prosecutes perpetrators of crimes and misdemeanors and protects citizens and state territory from any threat. At the very end, we have the conclusion of the entire paper and the literature. The literature required books by Croatian writers, online sources, and police-related laws. In this paper, you will get to know the police in detail.